Polive have found the gun used to kill Mr Mccollin
Detectives believe they are closing the gap on the killers of a man shot dead in a Greater Manchester takeaway.
Halton McCollin, 20, was shot once in the head after masked men burst into the China Garden, Stretford, in January. He died several days later.
On Wednesday, which would have been his 21st birthday, police revealed they had found the revolver used to kill him.
But detectives have yet to charge anyone with murder. They urged anyone with information to contact them.
Det Supt Pete Jackson, who has been leading the investigation, said: "We feel like we are closing the gap on Halton's killers, but we still need people's help to bring his family some justice.
"He would have been 21 today, but instead of celebrating his birthday with him, his family and his mates will be visiting his grave.
A £20,000 reward remains on offer for information leading to the conviction of his killers and Mr Jackson said detectives "would not give up".
He added: "We have been very busy behind the scenes speaking to people and collecting evidence about who was there that night, and who might be responsible.
"It might be that you think you know something insignificant but that, at this stage in the inquiry, is absolutely crucial to us.
"Halton's death was needless. He had so much potential. We will keep trying to bring his killers to court. I urge you again to help us."
The silver revolver was found by officers searching a house on Parrs Wood Road in May 2008 as part of an unconnected investigation.
Asim Bashir, 20, of Parrs Wood Road, Manchester, was jailed for six years for possession of a firearm with intent to endanger life in September in connection with this seizure.
Mr McCollin, a former pupil at Parrs Wood High School, was hit in the back of the head by a single bullet after masked men burst into the takeaway and fired three times.
He was a call centre worker and semi-professional footballer.